This is a massive piece, with origins currently unknown to us. It shares U.S. Glass' moulds for both the stem and bowl, with a scalloped rim also seen in known XLCR/Excelsior pieces, so our current working opinion is that it was either a prototype or a custom piece. Our inspection of the piece shows that the bowl is not fully level on the stem, giving more weight to it being a prototype. For size comparison, we have included two images, one overlaying the XLCR "Orange Bowl, as well as a 9" diameter XLCR Open Flared Bowl.